Doorknob-alarm



J. M. BUTCHER.

DOORKNOB ALARM.

APPLICATION HLED OCT. II, 1918.

Patented Jan. 6, 1920.

2 SHEETS-SHEET I.

WITNESSES.

J. M. BUTCHER.

DOORKNOB ALARM.

APPLICATION FILED OCT-11.1918.

Patented Jan. 6, 1920.

2 SHEETS-SHEET 2.

INVENTOR I TTORNEY UNITED STATES PATENT OFFICE.

JAMES M. BUTCHER, OF CI-IICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO MARSHALL DOBBINS & (30., OF CI'IIGAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DOORKNOB-ALARM.

Specification of Letters Patent.

Patented Jan. 6, 1920.

Application filed October 11, 1918. Serial No. 257,750.

To all whom it may concern:

Be it known that 1, James M. BUTCHER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Doorknob-Alarms, of which the following is a specification.

One object of the present invention is to provide a simple, cheap, and easily assembled spring actuated mechanism for developing the vibratory movement in a striker which cooperates with the bell or other sound-producing element in an alarm device; to

which end, one feature of the invention con sists in providing, upon a suitable base, bearings or mountings for the several elements of the alarm device, such as the spring arbor which carries the master wheel, the multiplying arbor with its driven. pinion and transmitting wheel, the third arbor with its driven pinion and ratchet, and the oscillating pallet or escape inent controlled by the ratchet and which carries the striker; and having these several members of the organization axially introduced into their hearings, or upon their mountings on the base, and overlapped one upon the other (for instance, in the reverse order in which they are above enum erated), so that when they are all brought successively in place they will be held in assembled relation one by another up to the last member to be introduced (for instance, the main arbor) and this will be secured by a readily releasable clip or key.

Another object of the present invention is to provide a novel'construction of pendulous mounting, through which to suspend an alarm from a door knob, and by which to release the alarm by pendulous action or change of angular position resulting tron partial turning of the door knob; the said mounting to be of a construction that may be produced very cheaply and assembled with minimum labor, mainly by interlocking of the parts, and with minimum use of screws, or the like. To thisend. a second feature of the invention consists in providing the knob clamp or hanger with. a pendulous rod and a releasing plunger assembled by niieans of projections and openings in the respective parts, which are engaged by introducing one part through the other while in position angularly displaced from the normal relative positions of the parts, and made to interlock by swinging the parts to their said normal positions, the pendulous hanger and the releasing plunger being moved in difi'erent directions from their assembling to their interlocking positions and being both thereafter connected with the alarm in a manner to prevent return to releasing position.

Still another object of the present invention is to provide a detent for the damper or stop of the alarm device, of such a character that may be moved to a position where it will automatically arrest the stop in its releasing position, once the latter is displaced by the action of the plunger resulting from the pendulous movement, and thereby insure continuance of the alarm even though the alarm may be restored to normal position by the release of the door knob. To this end, a third feature of the invention consists in providing, upon the sleeve of the spring arbor, a friction strap with a detent and a controlling arm projecting therefrom in position to present the detent in the path of the alarm stop, with the arm in position for manipulation in swinging the detent to and from its effective position, the strap embracing the sleeve with sutlicient resiliency to hold the det'eut in either position to which it may be moved.

The invention will be more fully understood upon reference to the accompanying drawings, in which one embodiment of each of the several features is disclosed by their illustration.

Figures 1 and 2 are front views of the complete alarm device (a portion of the bell being broken away) shown as applied to the shank of a door knob, Fig. 2 showing the alarm angularly displaced by pendulous action resulting fronr the turning of the knob.

Fig. 3 is a side elevation of the parts shown in Figs. 1 and 2.

Fig. l is a section on the line 4 4; of Figs. 1 and 3.

Figs. 5 and 6 are, respectively, a face view and a vertical section of the portion of the clamp with which the pendulum rod and releasing plunger are assembled; Fig. 5 showing the pendulum rod, and Fig. 6 the releasing plunger, in the positions angularly displaced from their normal poSiti S,.

which they respectively assume in being introduced into the recesses formed in the clamp to receive them.

Fig. 7 is a rear view of the alarm device detailing the attachment thereto of the pendulum rod.

F ig. 8 is a front View of the alarm device with the bell removed, and detailing the relation of the detent to the stop which controls the alarm.

Fig. 9 is a side view of the parts shown in Fig. 8.

Fig. 10 is a view detailing the assembly of the detent with the sleeve of the spring arbor; and

Figs. 11 and 12 are, respectively, a rear face view and an axial section detailing the assembly and securing of the spring arbor upon the base.

A represents the alarm; B the knob clamp; C the pendulum rod which suspends the alarm from the clamp; D the releasing plunger which converts pendulous motion into an alarm-releasing motion; and E the detent which prevents return of the alarm stop when the clamp resumes its normal angular position with relation to the alarm.

The alarm comprises the bell A and, as more clearly shown in Figs. 8 and 9, the vibrator A the ratchet A the multiplying wheel A, and the main spring arbor A These several parts intermesh 6% train. Each is mounted upon the usual center bearing, and the parts are made to overlap in such a manner that when assembled, and so long as the main arbor A is secured against aXial displacement, the parts will maintain their assembly and operative relationship; that is to say, the vibrator A has a portion that is overlapped by the ratchet wheel A while the pinion A? of said ratchet wheel, which meshes with the multiplying wheel A, is overlapped by the main wheel A? on the arbor A, as also is the multiplying wheel A To secure the main arbor A in its bearing sleeve A (Fig. 12), the bifurcated clip A", upon the rear face of the base A, enters the annular groove A of the arbor and is readily releasable therefrom at will. By this mode of assembly screws, rivets, and other time-consuming means are wholl eliminated.

In assembling the alarm with its clamp.

B, a pendulum rod C, having a T-head C is introduced into the swinging bearing C to which it is admitted by the radial slot C when the pendulum rod is in a position parallel to the plane of the clamp, but angularly displaced from its normal position, and this pendulum rod C is secured to the alarm A by means of the screws C one of which passes through the slot C while the other is adapted to receive the fork C so that but one of the screws need be removed in disassembling the parts.

The releasing plunger D is assembled with the clamp B by introducing its forked ends D through the arcuate slots B Each of these slots is in the form of an arc concentric with the upper end of the other slot, so that when'the hanger assumes an angular position (for instance, that shown in Fig. 2), theupper end of the slot engages a projection to depress the plunger and release the alarm, while the other projection swings in its arcuate slot to avoid interfering with the depression. The-plungerl) enters the tubular stem A of'the alarm and so encounters the stop A, which controls the vibrator A of the alarm, that when the plunger D is depressed, as described, the vibrator A is released and the alarm will sound.

The plunger D is assembled with the clamp B by introducing the pro]ections D through the slots B while (Fig. 6) the plunger is angularly displaced in a direction perpendicular to theplane of the clamp B, the projections D being so offset-from the plane of the plunger that when the plunger is swung back toward the plane of the clamp the projections will be (Fig. 4) interlocked with the clamp. Since the lower end of the plunger enters the hollow stem A and the pendulum rod C which is also interlocked with the clamp hasfbeen secured tothe shell of the alarm, it is obvious that the pendulum rod and plunger will remain assembled as described, since neither can execute the relative movementnecessary to release it. Obviously, the plunger will be first assembled with the clamp and then introduced with its lower end in the hollow stem A after which the pendulum rod will be assembled with the clamp and secured to the back of the shell of the alarm; or, if preferred, since the slot C and the fork C are elongated as shown, the pendulum rodC may be first assembled with the screw C occupying the lower end of the slot C the plunger D then put in place, the alarm moved upwardly upon therod C to cause the hollow stem A to receive the lower end of the plunger and bring the fork G into engagement with the lower screw C", after which the screws may be tightened up to hold the parts in the described relation. It will be obvious that the elongated form of slot C and fork C pro vide for exact adjustment of the alarm upon the pendulum rod, and therefore the correct range of displacing movement developed in the stop A by the inserted end of thev plunger. v

As will best be seen from Fig. 1.0, the de-' tent E comprises a strap E by which the detent embraces the sleeve A of the alarm, and which surrounds said sleeve with sufficient resiliency to hold the detent in any adjust ment to which it may be'moved; also the stop arm E and the finger lever E of which the former is movable into pQSif'iQI '00 arrest the pendulous releasing action of the alarm,

and, when so engaged, will prevent return of the alarm stop A even though the alarm is restored to normal position with relation to its clamp, and the alarm will continue to ring until the detent is voluntarily released. Obviously, if the detent is adjusted to its in active position, release of the alarm by depression of the stop A will be momentary, or continued only so long as the door knob is held in the turned position.

I claim:

1. In an alarm device, the combination of a single base member, and a series of alarm elements each having a bearing through which it is supported wholly by said single base member; each element being assembled with its bearing on the base memher by axial movement relative thereto; said elements being assembled in succession and overlapping one another to secure themin place; and the element last assembled w th its bearing having means engaging it with and securing it against axial separation therefrom.

2. In an alarm device, the combination of a single mounting member, alarm elements comprising a vibrator, a ratchet wheel controlling said vibrator, and a driving wheel controlling said ratchet wheel; said vibrator, ratchet wheel and driving wheel having each an independent bearing through which it is rotatably supported wholly from said single mounting member, and each be ing assembled into its said bear ng by axlal movement relative thereto; said elements being assembled in overlapped relation in the order named. whereby one is secured against axial displacement by another; and means being provided for enga'gingthe driving wheel with and securing it against axial separation from its bearing on the mounting member,

3. In an alarm device, a mounting, a serles of alarm elements having bearings upon said mounting and assembled therewith by relative axial movement between each mem her and its bearing; said alarm elements being engaged en 25min, assembled successively, and overlapped one upon another in series, and means for securing the last alarm element upon the mounting consistlng of an arbor carrying said alarm element and a spring clip engaging said arbor.

4. In a knob alarm, the combination of a support, an alarm device, and a connection between the support and the alarm device united with said support through the medium of a projection on one part entering an opening on the other part, assembled therewith while in a position angularly displaced from the normal positions of the parts, and interlocked by movement from the assembling to th normal position.

5. In an alarm device, the combination of an alarm, a support, and connecting members between the alarm and the support secured to the support through the medium of openings and projections assembled by introducing the projections into the openings while the connecting members are angularly displaced from their normal positions and interlocked by their movement from such assembling positions to their normal positions, the assembly positions of the respective connecting members being displaced in different directions from their normal positions.

6. In an alarm device, the combination of an alarm, a support, and connecting members between the alarm and the support secured to the support through the medium of openings and projections assembled by introducing the projections into the openings while the connecting members are angularly displaced from their normal positions and interlocked by their movement from such assembling positions to their normal positions, the assembly positions of the respective connecting members being dis placed in different directions from their normal positions; said connecting members having each an engagement with the alarm that prevents its return from normal position.

7. In an alarm device, the combination of an alarm, a support, and connecting members between the alarm and the support secured to the support through the medium of openings and projections assembled by introducing the projections into the open ings while the connecting members are angularly displaced from their normal positions and interlocked by their movement from such assembling positions to their normal positions, the assembly positions of the respective connecting members being displaced in difl'erent directions from their normal positions; said connecting members having each an engagement with the alarm that prevents its return from normal position, the engagement of one of said con necting members with the alarm being through a sliding movement longitudinally of the member and the other being through the medium of a releasable connection.

8. In an alarm device, the combination ofa support, an alarm, a pendulum rod connecting the alarm with the support, and a releasing plunger introduced between the support and the alarm; said releasing plunger having a longitudinal sliding movement in the alarm for releasing the same and having a pair of projections intersecting the plane of and adapted to bear against the support at points radially removed from the center of oscillation of the pendulum rod.

9. In an alarm device, the combination of a support, an alarm, a pendulum rod con necting the alarm with the support, and a releasing plunger introduced between the support and the alarm; said releasing plunger having a longitudinal sliding movement in the alarm for releasing the same and having a pair of projections intersecting the plane of and adapted to bear against the support at points radially removed from the center of oscillation of the pendulum rod; said support having slots to receive said projections, and said projections being deflected to permit them to pass through the slots and lie on the opposite side of the support from the plunger.

10. In an alarm device, a support, an alarm, a pendulum rod connected with the alarm and having a swinging bearing upon the support, and a releasing plunger having a longitudinal releasing movement in the alarm; said plunger having a bifurcated end by which itpenetrates the supports, the projections of said end being deflected to permit them to lie on the opposite side of the support from the plunger; said plunger being assembled from a position projecting angularly outward from the support and being interlocked therewith by movement into position parallel with the plane of the support.

11. In an alarm device, the combination of a support, an alarm, a releasing plunger having longitudinal sliding movement in the alarm and bearings at two spaced points upon the support, and a pendulum rod secured to the alarm and having an oscillating bearing upon the support at a point in termediate of the two bearings of the plunger thereon; said pendulum rod having a T-head entering its bearing upon the support; said last-named bearing being shaped to admit the T-head when the pendulum rod is in a position angularly displaced from that in which it is secured to the alarm.

12. In an alarm device having a releasing stop, a detent constructed to engage said stop and having a setting movement which presses it toward position to engage the stop; said detent being resilient whereby it moves into engagement with the stop when the latter is moved to release the alarm.

13. In an alarm, a releasing stop normally resisting action of the alarm, means for displacing said stop to release the alarmto its action, and a detent carrying means for engaging the stop in its alarm-releasing position, movable into and out of effective position at will, and having its stop engaging means resiliently supported whereby it automatically enters into engagement with the stop whenset to control the latter.

14. In an alarm, bearing sleeve, a resilient strap encircling said bearing sleeve, an arm projecting from said strap, a detent on said arm, a stop for controllin the alarm, and means for adjusting the detent to and from position to engage the stop.

15. In an alarm, the combination with a bearing sleeve, a resilient strap encircling said bearing sleeve, an arm projecting from said strap, a detent on said arm, a stop for controlling the alarm, and means for adjusting the detent to and from osition to engage the stop; said stop being in the path of the detent when the stop is in alarmarresting position, said arm being resilient and throwing the detent in the path of the sto when the stop assumes its alarm-releas ing position.

16. In an alarm, the combination with a bearing sleeve, a resilient strap encircling said bearing sleeve, an arm projecting from said strap, a detent on said arm, a stop for controlling the alarm, and means for adjusting the detent to and from position to engage the stop; said stop being in the path of the detent when the stop is in alarmarresting position, said arm being resilient and throwing the detent in the path of the stop when the stop assumes its alarm-releasing position; said strap also carrying an arm controlling the position of the detent arm.

Signed at Chicago, Illinois, this 28th day of September, 1918.

JAMES M. BUTCHER.

the combination with a 

